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Alanine-Scanning Mutagenesis of α-Conotoxin GI Reveals the Residues Crucial for Activity at the Muscle Acetylcholine Receptor

Recently, the muscle-type nicotinic acetylcholine receptors (nAChRs) have been pursued as a potential target of several diseases, including myogenic disorders, muscle dystrophies and myasthenia gravis, etc. α-conotoxin GI isolated from Conus geographus selectively and potently inhibited the muscle-t...

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Autores principales: Ning, Jiong, Li, Rui, Ren, Jie, Zhangsun, Dongting, Zhu, Xiaopeng, Wu, Yong, Luo, Sulan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6315591/
https://www.ncbi.nlm.nih.gov/pubmed/30551685
http://dx.doi.org/10.3390/md16120507
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author Ning, Jiong
Li, Rui
Ren, Jie
Zhangsun, Dongting
Zhu, Xiaopeng
Wu, Yong
Luo, Sulan
author_facet Ning, Jiong
Li, Rui
Ren, Jie
Zhangsun, Dongting
Zhu, Xiaopeng
Wu, Yong
Luo, Sulan
author_sort Ning, Jiong
collection PubMed
description Recently, the muscle-type nicotinic acetylcholine receptors (nAChRs) have been pursued as a potential target of several diseases, including myogenic disorders, muscle dystrophies and myasthenia gravis, etc. α-conotoxin GI isolated from Conus geographus selectively and potently inhibited the muscle-type nAChRs which can be developed as a tool to study them. Herein, alanine scanning mutagenesis was used to reveal the structure–activity relationship (SAR) between GI and mouse α1β1δε nAChRs. The Pro(5), Gly(8), Arg(9), and Tyr(11) were proved to be the critical residues for receptor inhibiting as the alanine (Ala) replacement led to a significant potency loss on mouse α1β1δε nAChR. On the contrary, substituting Asn(4), His(10) and Ser(12) with Ala respectively did not affect its activity. Interestingly, the [E1A] GI analogue exhibited a three-fold potency for mouse α1β1δε nAChR, whereas it obviously decreased potency at rat α9α10 nAChR compared to wildtype GI. Molecular dynamic simulations also suggest that loop2 of GI significantly affects the interaction with α1β1δε nAChR, and Tyr(11) of GI is a critical residue binding with three hydrophobic amino acids of the δ subunit, including Leu(93), Tyr(95) and Leu(103). Our research elucidates the interaction of GI and mouse α1β1δε nAChR in detail that will help to develop the novel analogues of GI.
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spelling pubmed-63155912019-01-10 Alanine-Scanning Mutagenesis of α-Conotoxin GI Reveals the Residues Crucial for Activity at the Muscle Acetylcholine Receptor Ning, Jiong Li, Rui Ren, Jie Zhangsun, Dongting Zhu, Xiaopeng Wu, Yong Luo, Sulan Mar Drugs Article Recently, the muscle-type nicotinic acetylcholine receptors (nAChRs) have been pursued as a potential target of several diseases, including myogenic disorders, muscle dystrophies and myasthenia gravis, etc. α-conotoxin GI isolated from Conus geographus selectively and potently inhibited the muscle-type nAChRs which can be developed as a tool to study them. Herein, alanine scanning mutagenesis was used to reveal the structure–activity relationship (SAR) between GI and mouse α1β1δε nAChRs. The Pro(5), Gly(8), Arg(9), and Tyr(11) were proved to be the critical residues for receptor inhibiting as the alanine (Ala) replacement led to a significant potency loss on mouse α1β1δε nAChR. On the contrary, substituting Asn(4), His(10) and Ser(12) with Ala respectively did not affect its activity. Interestingly, the [E1A] GI analogue exhibited a three-fold potency for mouse α1β1δε nAChR, whereas it obviously decreased potency at rat α9α10 nAChR compared to wildtype GI. Molecular dynamic simulations also suggest that loop2 of GI significantly affects the interaction with α1β1δε nAChR, and Tyr(11) of GI is a critical residue binding with three hydrophobic amino acids of the δ subunit, including Leu(93), Tyr(95) and Leu(103). Our research elucidates the interaction of GI and mouse α1β1δε nAChR in detail that will help to develop the novel analogues of GI. MDPI 2018-12-13 /pmc/articles/PMC6315591/ /pubmed/30551685 http://dx.doi.org/10.3390/md16120507 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ning, Jiong
Li, Rui
Ren, Jie
Zhangsun, Dongting
Zhu, Xiaopeng
Wu, Yong
Luo, Sulan
Alanine-Scanning Mutagenesis of α-Conotoxin GI Reveals the Residues Crucial for Activity at the Muscle Acetylcholine Receptor
title Alanine-Scanning Mutagenesis of α-Conotoxin GI Reveals the Residues Crucial for Activity at the Muscle Acetylcholine Receptor
title_full Alanine-Scanning Mutagenesis of α-Conotoxin GI Reveals the Residues Crucial for Activity at the Muscle Acetylcholine Receptor
title_fullStr Alanine-Scanning Mutagenesis of α-Conotoxin GI Reveals the Residues Crucial for Activity at the Muscle Acetylcholine Receptor
title_full_unstemmed Alanine-Scanning Mutagenesis of α-Conotoxin GI Reveals the Residues Crucial for Activity at the Muscle Acetylcholine Receptor
title_short Alanine-Scanning Mutagenesis of α-Conotoxin GI Reveals the Residues Crucial for Activity at the Muscle Acetylcholine Receptor
title_sort alanine-scanning mutagenesis of α-conotoxin gi reveals the residues crucial for activity at the muscle acetylcholine receptor
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6315591/
https://www.ncbi.nlm.nih.gov/pubmed/30551685
http://dx.doi.org/10.3390/md16120507
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